So you have a 15db to 25db signal OR as diagnostics calls it SNR which isn't that good but isn't really bad either.Īs Apple is not very explicit on what it actually shows with the bars, I can only tell you my observations. Also an increase in RF intereference from microwave ovens, cordless phones, walls, ceilings, etc, which would increase the noise level, would also decrease the overall SNR value. The calculated SNR value, as measured from a wireless client, would decrease as the range to the base station increases due to applicable free space loss. For example, a signal level of -53dBm and a noise value of -90dBm would yield an SNR of 37dB (i.e., SNR = Signal - Noise = -53 -(-90) = 37) Both of these values are typically represented as negative numbers. SNR is the signal level (in dBm) minus the noise level (in dBm). One method to calculate signal quality is to compute the Signal-to-Noise Ratio (SNR). While you have a good signal strength, your throughput speed ( Tx Rate ) isn't that fast. So if you're asking for a scale I think its around 10 to 12.5 RSSI per bar. Not sure if it will go to -100 since you don't have a signal then ) 50 will show all the bars and -90 will show gray bars. Most people will see a number between about -50 and -80, with around -50 being excellent. The higher the number ( closer to 0 ) the better your signal strength.įor Apple devices they used a scale of -100 to 0. RSSI or Received signal strength indication is what is used for the display of the bars.
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